Press Release

Turnon Components Introduces the Bunker Dropper Post 6

An all-new dropper post that features a double air chamber system.

Turnon Components
1/10/2022 7:54pm
s1600 Hellogorgeous 253077

Introducing Turnon Components, an all-new dropper post company that has launched its inaugural Bunker dropper post. After months of development and with almost a decade of experience in manufacturing dropper posts, the Bunker features a double air chamber design and high-performance wiper seals to create a water and dustproof system. 

Bunker waterproof video

Bunker Dropper Highlights:

  • Double air chamber system (patent pending)
  • Travel (mm): 126 / 160 / 190
  • Diameter: ø30.9 / ø31.6  (ø30.9 will available on June)
  • Routing: Internal only
  • Two year warranty
  • MSRP: $269 USD (Post only)
  • Bunker 1-by remote: $55 USD

Most of dropper posts Issues

Double Air Chamber System (Patent Pending)
  • Lost grease (every dropdown squeeze out)
  • The sand invades and scratch parts
  • Foam blockage by mud or dust
  • Water invade (get rust fast and the low temperature became to ice)
  • Air mixes issue
  • Waterproof & Dustproof
  • Support the weight by high air compressed with no air mixing issues 
  • Chamber one, PSI: 300~350 
  • Chamber two's pressure comes from the compressed volume
  • Tougher wiper used to increase performance

Compare with blowhole design

Bunker 1-by front
Bunker 1-by back


Bunker 1by-remote video

Bunker Remote 

Featuring a three axis adjustment, the Bunker Remote uses IGUS bushing, which is waterproof and much lighter overall. Also utilizes a small crank with less strength that allows for a light action and a longer lever. For other dropper post brands please confirm that the wire pull distance does not exceed 6mm.

Bunker Specs

Dropper Posts Compare

For more information about the Bunker dropper post, please visit  Turnon Components


Related:
Seatposts
Turnon Components
6 comments

View replies to: Turnon Components Introduces the Bunker Dropper Post

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HexonJuan
2 years ago
I have 2 droppers, a PNW and a TranzX. Both exhibited issues with grease getting pushed past the head seal in use, leaving a ring around the stanchion. The PNW has 'blow hole' (vents to the rest of us), the Tranz did not. I drilled the vents to a larger diameter on the PNW and added them to the Tranz. Both posts now return faster (without changing air pressure in either) and neither weeps out of the head seals any more. I deduce that pressure inside the posts as stock was causing the grease to get pushed out, and the resulting vacuum during the compressed to extension cycle inhibited the return of the post. That said, it appears these folks have gone the route of making the post and stanchion seal interfaces air tight to have effectively two air chambers, one from the body, one from the cartridge. I expect the lever needed to be longer and with more mechanical advantage (given by the smaller arc radius the cable runs over) to overcome seal stiction on the actuator. I've never run into issues with dropper actuation in below 0F, nor have I had any issues with water ingress (and there have been many, many beach rides on the fatty where the bike was used as a floatie), though I have heard grumblings of dirt/mud/what have you getting sucked into droppers from others. IME, increasing the diameter/adding vent holes solves these issues by allowing the internal pressure to equalize out the bottom easier. No doubt these folx have good intentions, but I'll hold off on passing judgment til there's more time in the field on em.
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Turnon Components
2 years ago
Hi @HexonJuan
Thank you for raising your concerns and sharing your practical experience
1. Vacuum
2. Grease extrusion
According to my explanation, the reason for these two occurrences is that it is not completely sealed. Of course, directly expanding the ventilation holes can solve some problems first, but it will also cause other problems.
By the way, the force/frequency of the droppers is much lower than that of a completely sealed air shock
Honestly speaking, the seals has a lifespan. After we have tested Bunker more than 100,000 times, the seal remains strong.
Welcome to explore together
c50 cartman cop 1661369238
Tisickboy
2 years ago
Not sure why we need to overcomplicate droppers now. I've had a 9point8 dropper for 7 years and it still works flawlessly and it has very simple internals that are easy to self-service.
1
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Turnon Components
2 years ago
For example, if you look at this form alone, doesn't Fox look bad? the truth is that they do a good product too, there are a lot of details and advantages that this form doesn't tell you
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